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Molecular Gas in NUclei of GAlaxies (NUGA)
- Source :
- Astronomy & Astrophysics. 407:485-502
- Publication Year :
- 2003
- Publisher :
- EDP Sciences, 2003.
-
Abstract
- We present new high-resolution observations of the nucleus of the counter-rotating LINER NGC4826, made in the J=1-0 and J=2-1 lines of 12CO with the IRAM Plateau de Bure mm-interferometer(PdBI).The CO maps, which achieve 0.8''(16pc) resolution in the 2-1 line, fully resolve an inner molecular gas disk which is truncated at an outer radius of 700pc. The total molecular gas mass is distributed in a lopsided nuclear disk of 40pc radius and two one-arm spirals, which develop at different radii in the disk. The distribution and kinematics of molecular gas in the inner 1kpc of NGC4826 show the prevalence of different types of m=1 perturbations in the gas. Although dominated by rotation, the gas kinematics are perturbed by streaming motions related to the m=1 instabilities. The non-circular motions associated with the inner m=1 perturbations agree qualitatively with the pattern expected for a trailing wave developed outside corotation ('fast' wave). In contrast, the streaming motions in the outer m=1 spiral are better explained by a 'slow' wave. A paradoxical consequence is that the inner m=1 perturbations would not favour AGN feeding. An independent confirmation that the AGN is not being generously fueled at present is found in the low values of the gravitational torques exerted by the stellar potential for R<br />A&A, 2003, Paper accepted (04/06/03). For a full-resolution version of this paper see http://www.oan.es/preprints
- Subjects :
- Physics
Star formation
Astrophysics (astro-ph)
FOS: Physical sciences
Astronomy and Astrophysics
Context (language use)
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Radius
Inflow
Rotation
Galaxy
Gravitation
Space and Planetary Science
Astrophysics::Earth and Planetary Astrophysics
Astrophysics::Galaxy Astrophysics
Line (formation)
Subjects
Details
- ISSN :
- 14320746 and 00046361
- Volume :
- 407
- Database :
- OpenAIRE
- Journal :
- Astronomy & Astrophysics
- Accession number :
- edsair.doi.dedup.....930afd86049ef60d0639b05f6c067874